Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 6502.44 
• Atom Count: 449 
• Residue Count: 57 
• Unique protein chains: 1

2MI5

Structure of insect-specific sodium channel toxin mu-Dc1a

• DOI: 10.2210/pdb2MI5/pdb
• BMRB: 19666

• Classification: TOXIN
• Organism(s): Diguetia canities
• Expression System: Escherichia coli


• Deposited: 2013-12-08 Released: 2014-07-23 
• Deposition Author(s): Bende, N.S., Mobli, M., King, G.F.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: Best MolProbity score 

Literature

A distinct sodium channel voltage-sensor locus determines insect selectivity of the spider toxin Dc1a.

Bende, N.S., Dziemborowicz, S., Mobli, M., Herzig, V., Gilchrist, J., Wagner, J., Nicholson, G.M., King, G.F., Bosmans, F.

(2014) Nat Commun 5: 4350-4350

• PubMed: 25014760 
• DOI: 10.1038/ncomms5350


• PubMed Abstract: 
  

β-Diguetoxin-Dc1a (Dc1a) is a toxin from the desert bush spider Diguetia canities that incapacitates insects at concentrations that are non-toxic to mammals. Dc1a promotes opening of German cockroach voltage-gated sodium (Nav) channels (BgNav1), whereas human Nav channels are insensitive. Here, by transplanting commonly targeted S3b-S4 paddle motifs within BgNav1 voltage sensors into Kv2.1, we find that Dc1a interacts with the domain II voltage sensor. In contrast, Dc1a has little effect on sodium currents mediated by PaNav1 channels from the American cockroach even though their domain II paddle motifs are identical. When exploring regions responsible for PaNav1 resistance to Dc1a, we identified two residues within the BgNav1 domain II S1-S2 loop that when mutated to their PaNav1 counterparts drastically reduce toxin susceptibility. Overall, our results reveal a distinct region within insect Nav channels that helps determine Dc1a sensitivity, a concept that will be valuable for the design of insect-selective insecticides.

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Related Citations: 

• Characterization and cloning of insecticidal peptides from the primitive weaving spider Diguetia canities.
  Krapcho, K.J.,Kral, R.M.,Vanwagenen, B.C.,Eppler, K.G.,Morgan, T.K.
  (1995) Insect Biochem.Mol.Biol. 25: 991
• Mode of action of an insecticidal peptide toxin from the venom of a weaving spider (Diguetia canities).
  Bloomquist, J.R.,Kinne, L.P.,Deutsch, V.,Simpson, S.F.
  (1996) Toxicon 34: 1072




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Organizational Affiliation: 

Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland QLD 4072, Australia.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Mu-diguetoxin-Dc1a	A	57	Diguetia canities	Mutation(s): 0
Find proteins for P49126 (Diguetia canities) Go to UniProtKB:  P49126

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: Best MolProbity score 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-12-08 
• Released Date: 2014-07-23 
• Deposition Author(s): Bende, N.S., Mobli, M., King, G.F.

Revision History 

• Version 1.0: 2014-07-23
  Type: Initial release